I am installing this also. Next time I will make meticulous notes but for now all I have written down is:
#cd /usr/portage
# scripts/bootstrap.sh

I think when I typed that it took off and ran for hours, maybe all night.
The next thing I wrote down is :
#emerge -e system

Again it ran for hours, I think. I typed "emerge -e system" because when bootstrap was finished there was a message on the terminal that said to type that command so I followed that instead of some other command that I had seen. Everything seems to work well so far. I am emerging x11 right now and it has been running for maybe 3.5 hours.